The H1 tag (<h1>) serves as the main heading of your webpage, acting much like the title of a book or the headline of a newspaper. To create one, you wrap your specific heading text between an opening <h1> tag and a closing </h1> tag. This structure signals to both web browsers and search engines that the enclosed text is the most significant subject on the page, which is vital for both SEO and accessibility.

Syntax Example: To display a main title that reads “My Portfolio,” you would write:

<h1>My Portfolio</h1>